Toyota 2015 Sienna Manual page 530

530
8-1. Essential information
WARNING
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If the engine has to be turned off while driving
Power assist for the brakes and steering wheel will be lost, making the
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brake pedal harder to depress and the steering wheel heavier to turn.
Decelerate as much as possible before turning off the engine.
Vehicles without a smart key system: Never attempt to remove the key, as
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doing so will lock the steering wheel.
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